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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0df6f0eb120ca2ef277b05ae60d3241d4aa05d9a80023802633dbbfa0bb920' 
  AND token = 'NKO+tU96BaN9wm58lOfK3E4szWFmd0juQWE2pJjofSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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