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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e32f3d96f5c4b654791d6b6a7e2bd153a94a49e71ab7b7ed451891df4806d6' 
  AND token = 'rDPV+b634eqSMaZ79otUB0oiRnsGjKb5Aye/WoFWFWY=' 
  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"
    }
  }
}