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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5416774456b3ff93e668263c4ec2720173a04fc19d7fdd8adf2809cab5f26bb5' 
  AND token = '65D3+ZIPilSISkt+Pp0v/+sjiW6TWnX4eX7yLmOO9rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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