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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6826cd8aacd73f8a00f486cbd431a27363d025c1f73f9a2a1e54654f1cceb4' 
  AND token = 'PYdmYNvId1Iz8m89ag4oaB5k9YjK2c76CnIL99+Tr/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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