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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c186e60757020b9f37b43bee79e6f9a9582c49b31aa1ccfef16774da25ba835b' 
  AND token = '2kjwlzwG1qWhPUJAQVFnisjstO3FIFItSyydkeggbyI=' 
  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"
    }
  }
}