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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855dcb2f721fa4c5fb76f4dbfaaa10a4660585287f7a7f371136f81fa871abf0' 
  AND token = 'cAPkJDgJSsbhmXZsYPiKRhcXC63K7PonHw3U8OGKGPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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