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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8551314574ea73e64157666c8e4b63dcf7530067341087af27909be43eabb2df' 
  AND token = 'r5BWrA6P+pypRrI5VP+w83uc3hYt9LRvuSMkOJ4oOL0=' 
  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"
    }
  }
}