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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf3e1cdabfcaaab3441bb6a053d0cc87588b130361f84b6c12a40e78956c8e3' 
  AND token = '5s8G41Lk3JL7xVQetCJ18500gQNUIXWgy2ALN8GI8B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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