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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d824dfe12aa9da7a8a46dccb9621f487e00316901fd8a847b23067d6b8c1d1' 
  AND token = '3iPG3ykuL2ra8KrR+td4aYfZ0DdOwW/LhXDeZK5Jkz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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