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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfaa428b3c52d5cc5bf52119190faaf352b5f7775bf7897bf1978e78db52b89' 
  AND token = 'n3auRDJvhSqkJ5j61otaWPwVFzJ4UykNE7KNo4Wp9VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}