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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55f4c1349167503610d2da9a9d8ad906a307f5c671d46e1b4ab45b742d6c5e8' 
  AND token = 'TKtOSmasfFQZAyN11/rP6E9IGeeRYF22VDRNc3391dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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