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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3571a37cd2f4cf243d45f75556aa789240e7c512dd05374c788ea4b2c20f4bce' 
  AND token = '7lIPNbTAVepsRx5NZyryyOt7Z3Ek0QXlAxEmCFPk0qk=' 
  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"
    }
  }
}