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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf0972ad1650892e4f2b1235ff7a3cec5c43ee794915d05a12ae28b00392388' 
  AND token = 'R2Oktxqgqfpu1K6GYgAViIIIkCZi5mncNb4v3mUdToE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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