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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87af2777c8c8e106c4acdac9833ef4a954b911d8032b71ba81b22d178a52fee' 
  AND token = 'qSZ8q5AMzBLDuESp6Sk3drXo6FdHdelvAIVSUQAPs6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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