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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23636b1e56b7dd9c32c58e32e109f23d25810a7c9e53da5bf3a14a0be9ed0ee3' 
  AND token = 'bpuoSKj893ntEIj4+o6WY0DcA55VVyY1lMo5ByxmL4I=' 
  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"
    }
  }
}