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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a1681328e8c79b47b02af21c31f3f0fce38f5f9604c05b6e351759b4e5d32b' 
  AND token = 'fmyTiR9VO3SChPsNPm1n0K6qywOHcty0fgMJpOg1/EI=' 
  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"
    }
  }
}