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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1585f906bc11f5820e55b7cd32f7c6473d5c460d1d3eadeb740049800efe0e30' 
  AND token = 'liZOk9tmPwWEcW4dbEwlpT+Qfx7RwMfvhBhuIWm/3ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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