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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a2befaeee47d54b3005aeddd293cb4f6ab8c595fd35776064d6f35883fa0d4' 
  AND token = 'x5yiFtaBA3Plbp7sQNeArTJy+uRXMNCi0fjAef/VbfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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