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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbec3ce8a79875f169a508bb2ea61be26879e27577b0d80a6d96d2fbc702fda' 
  AND token = 'juZtRXLCQKJiaY/ZFk6Tk+r9wrLir0QBadRp8Bp3Do8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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