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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c5ca320d24c3e7e1e4a0c565c326676d391683e28c54147975b28dc9a593cf' 
  AND token = 'Mke2z9637Z1jObws45nnGOPjGHyvxZdNuz+BNexYWTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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