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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72dc8b5b89137609e046c05e6ebf0796983d0ac39f5aff6aecb4cc3b20b0da36' 
  AND token = 'PhW4p7j89I0kAGrFMUsmnygZlTS8hdSGdBrZJdE4rD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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