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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b428e203af17a2962210e85bb0e40e98f0f4a7ee08f206fd31312dbffcd7a97a' 
  AND token = 'maRLurpYsxd2T8IAvD/Jh2NwlFFDtyBh0Orgwt3CTpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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