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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5226405734c09d6ba8cf4604aab17b189393364dd2ac2352a5f5f584b1f6232' 
  AND token = 'T1lyH1YQSAwGcYNgzn684otGHAQJDgMk7pJD2piMiew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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