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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d44447ef33e6a0ac2860ace2dd2f0bb32a8439ef13a17febccd417d5a5e045' 
  AND token = '/sp6FJWJ/R7qhRR0ntNIV9S4fl3IPWL1TRh3Vz8HWVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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