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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc5dfe90dc85a2f8c118cd82e44a31817d4fa985f1bbbc7b252208e4970dc06' 
  AND token = 'XoIGorK5MJBL/JDr/oH6p3qYsQDfaRpU5eAWN/+sgFo=' 
  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"
    }
  }
}