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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333dee20940c4a27f7472d60a7ddc732bf334d3fbe179011238066928f42d310' 
  AND token = 'ptC/CVhA9E6scSs1kCpPI7uSjSDPqasI6vz33SFvB9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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