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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249f1e466d0d7a4572ed4be3a39d6fbf4c44d04f5a04fd4e285ba483c3fb3f8a' 
  AND token = 'NaD6bHuWROhwGSsyHPGZI1ysNkOm2GlhzW74W0PG8ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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