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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7856d4109a1a9093d65315aa7df9466c15c91318d89234a6048e07ad5a8a7db2' 
  AND token = 'iEqU7h35y3YDuPb+q8UUe5GlVDdTcEvuHjD2PtPPS4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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