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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b69fda9f85596544fc1ee4e4d8d9dd01539a2de473d10fa55ee041918f7356' 
  AND token = 'YVlOE/OT7ZEuHu7Apvx1or+Um6Rr6bAUY2M+ViLbVbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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