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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b2dc42e46534f73472a704754a5d3be89a3a809837038078d89a8cf1f4a391' 
  AND token = 'EL6cEjs2ehXQ+KzmY9zu00bVsNEZMLNryriKUNwD02o=' 
  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"
    }
  }
}