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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f0be59adb113dace7865ff0153e6ce2637239983fce5f327a1c07ceca2e759' 
  AND token = 'mzwb0xHa+HPxnJXPIveSBBJpvI6n61DW6NinaImz8Bc=' 
  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"
    }
  }
}