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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0696e5fb4d744e04af0a3f552861423ea5dd78c32363d2878c18be96f904f39f' 
  AND token = 'cyOoMNqh58han0iMcGGcuA9MHllKnzzZ5FYI1vA2Bi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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