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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef994c782fcee4feb0a470098ded2823feec3625c3c0454e52e9035962dbfa73' 
  AND token = 'fuztKlz9SbitYy0z3XjSji4i1ZHlb4bsvWskrHYCbcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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