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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbdc0a8a0d86206c1f15180ba23f1c5088c6eea4414cdb58757ad9e263cf588' 
  AND token = 'BtLXwUS92prjM0X0CaIYDeFSSQyoxAwawFiyZK8xiF0=' 
  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"
    }
  }
}