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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddb3dde0b443d7e9edebb812239abed9e3faf60c72079e5c5cf1c1c769788fe' 
  AND token = 'fqHbGZPywKOzJ5ttf6oZpMbO352iC0qr9hV+R/X0eYc=' 
  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"
    }
  }
}