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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14eaaf9ef686317f8d0552b6774864cd97b2507804c86f19d6f2bb300f2a5cb7' 
  AND token = 'tpl0Um5d+WN7+x3SHv7N97bkqKsqY/85E1Rab75q6Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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