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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df4d4935a420d20c62dd43eb71bf5c5e23ffa710906d5ca1db74f03f71e4fcce' 
  AND token = 'WNq4HmQF0iaHUeYkNHrnz7nX6w5s2M+sZ1D/c6FH22A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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