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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c27e549ebb24d0ce0ce7819da928a1d77172fd61df51c92cb7b1ec3e1c85f99' 
  AND token = 'UbhavPUzFrP9YlGzDn6j5qzXRcXrB8qJQ0P9r3acOG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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