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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c774ebdd785adde4d32416b277919495c0924041972cf84aa1eeda019ab2ee2' 
  AND token = 'g9CpT/HfPucEpQzOoJn9NCOpIInH3RwER3x4mhUWza4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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