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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8a678c5efa8c1b90ad2e3d2d7b290ec58aedf4efc0cb3a01902b9cc34c7a8a' 
  AND token = 'UCc28GD2qpPMcPAe6Yy0jXU7Yccbdr6OE6vMa6jpD6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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