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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f98ec4f99b5f7ec5bc3cca0a27265c540b1b7c07182c63b6dccb12d51a629d7' 
  AND token = 'cbiu65ki4hG2EmZvj25v81zNSH0h7QyMdQMRhp+gDLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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