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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fac3c4545854952451673b6c85a693512d336b7ca74d5180ffcc461b6937c07' 
  AND token = '09USLYmIXU+p3YFq6iHp5q4Ahun53KbtVaZbjD4nm2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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