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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565d9ea821d9f1569b178b0e21a19a8b26e86ae37e30ab2aad0dccc0db2042d8' 
  AND token = 'igra6Zamt0g/WW07xcj1vF3rJF8OTKoYIM5qRT4Ogag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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