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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0febe8356cd47d249ece481ad9e955e71eb55c22c242b3d485ae313b016bd2c' 
  AND token = 'bvoGEkv2QSEBHlniFWcgnOzO2S5iqkQ/14XeKOd0r0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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